JPS63146640A - Terminal bus monitor - Google Patents

Abstract

PURPOSE:To easily mount a terminal bus monitor to a terminal bus by connecting an interface section of a terminal bus monitor to the terminal bus in the same manner as a digital terminal equipment. CONSTITUTION:A receptacle based on the terminal bus interface specifications is used for the connection between a terminal bus 2 and a digital terminal equipment 1-1. The interface section 11 of a terminal bus monitor 6 is the same as that of the digital terminal equipment 1-1, and to be connected to an idle receptacle, and an optional idle receptacle is selected to connect the terminal bus monitor 6 to the terminal bus 2. Thus, the trouble of decomposing a digital terminal equipment to connect a monitor measuring instrument to the internal printed board package is relieved and the hindrance of the operation of a subscriber's system is eliminated.

Description

[Detailed Description of the Invention] [Summary] A digital terminal device connected to a terminal bus is provided with the same terminal bus interface as the digital terminal device, is connected to the terminal bus in the same way as the digital terminal device, and frames transmitted on the terminal bus are extracted. Then, data and control information are extracted from the frame and monitored.

[Industrial application field]

The present invention relates to a home system connected to a digital exchange, and more particularly to a terminal bus monitor device that monitors information sent and received by digital terminal devices from a terminal bus to which the digital terminal devices are connected.

Telecommunications services have expanded from being centered around telephones to communication media such as data, facsimile, and video, and advanced and diverse services have begun to be provided, and the construction of integrated service digital m (ISDN) has progressed. There is.

Digital exchanges are used for such services;
The terminal devices of the subscriber's home system to be connected include digital telephone terminals, facsimiles, video, and other digital terminal devices, which are connected to a common terminal bus, but the various digital terminal devices mentioned above are It is desired to provide a terminal bus monitor device that can easily extract and monitor transmitted and received information from a terminal bus.

[Conventional technology]

FIG. 3 is a block diagram of a conventional home system, and FIG. 4 is an explanatory diagram of frames in a terminal bus.

In FIG. 3, 1-1 to 1-N are various digital terminal devices having a common terminal bus interface.
Each has an interface part 11 based on a common terminal bus interface and is connected to the terminal bus 2 by a core part.

The terminal lotus 2 includes the digital terminal devices 1-1 to 1-N.
and a subscriber terminal device 3 that controls communication with the digital exchange 5 and constitutes an in-home system 1.

The subscriber termination device 3 is connected to a digital subscriber circuit 51 of a digital exchange 5 by a digital subscriber line 4;
Communication between the home system 1 and the digital exchange 5 is performed according to a communication protocol with the digital exchange 5.

Subscriber terminal equipment 3 and various digital terminal equipment 1~l~
Communication between 1 and 1N is performed using information allocated to the frames shown in FIG.

In FIG. 4, F is a frame bit for frame synchronization, Ll, L2 is a bit group Bl for maintaining balance within the frame when this frame is transmitted on a terminal bus in a bipolar signaling system.
1 and B12 each consist of 8 bits and are constituent elements of data channel B1 for transmitting data, bit group B21.
, B22 are constituent elements of data channel B2, each consisting of 8 bits, for transmitting data, D1 to D4 are constituent elements of control channel D, for transmitting control information, and blank spaces are used for other control purposes.

As shown in Figure 4, an l frame consists of 48 bits,
Since it is transmitted in 250μs, the terminal bus is 192KBPS.
Information is transmitted at a speed of There are also two data channels for transmitting information: a data channel Bl.

B2) each have a rate of 64 KBPS, and control channel D, which transmits control information, is transmitted at a rate of 16 KBPS.

Each of the digital terminal devices Ll to 1-N and the subscriber terminal device 3 allocates data to the data channel Bl or data channel B2, allocates control information to the control channel D, sends it to the terminal bus 2, and upon reception, the terminal bus 2, and the data and control information included in the above channels are extracted for communication.

In order to monitor the data or control information of the digital terminal devices 1-1 to 1-N, it is not possible to connect a monitor measuring device to the terminal lot 2, so the measuring device is directly connected to, for example, a register of the digital terminal device to be monitored. Monitoring is performed by connecting a device and extracting data or control information.

[Problem that the invention seeks to solve]

In order to connect a monitor measuring instrument to a digital terminal device, troublesome preparations such as mechanically disassembling the digital terminal device and connecting the monitor measuring instrument's connection cord etc. to a printed circuit board package equipped with the required resistors etc. are required. There is a problem that operation is required, which hinders the operation of the in-house system.

[Means for solving problems]

FIG. 1 is a block diagram of the principle of the present invention.

In the figure, 2 is a terminal bus.

Reference numeral 6 indicates a terminal lotus monitor device according to the present invention. 11 is an interface unit having the same configuration as that of the digital terminal device 1-1 connected to the terminal bus 2; 61 is a frame extraction unit that extracts frames from the terminal bus 2 through which information is transmitted in frame format; and 62 is a This is a frame decomposition unit that decomposes the extracted frame and extracts the data and control information contained within the frame.

[Effect]

As signals on the terminal bus 2, frames containing data and control information issued from the digital terminal device 1-1 etc. for communication are continuously transmitted.

By connecting the interface section 11 of the terminal bus monitor device 6 to the terminal bus in the same manner as the digital terminal device 1-1, the terminal bus signal is received via the interface section 11, and the frame is extracted by the frame extracting section 61. , the frame is decomposed by a frame decomposition unit 62, data and control information are extracted and monitored.

In this way, the trouble of disassembling the digital terminal device and connecting a monitor measuring device to an internal printed circuit board package or the like is eliminated, and the operation of the in-home system is no longer obstructed.

〔Example〕

The present invention will be specifically explained below with reference to illustrated examples.

FIG. 2 is a block diagram of a terminal bus monitor device according to an embodiment of the present invention. The same reference numerals indicate the same objects throughout the figures.

In the figure, a BU conversion circuit 63. which converts a bipolar signal used on the terminal bus 2 into a unipolar signal. Frame extraction circuit 64. The clock generation circuit 65 corresponds to the frame extraction section 61 in FIG. 1, and the frame decomposition circuit 66,
Clock generation circuit 65 corresponds to frame decomposition section 62 in FIG.

A case in which data from the digital terminal device 1-1 is allocated to, for example, the data channel B1 of a frame and control information is allocated to the control channel D and sent out to the terminal bus 2 will be explained.

The terminal bus 2 and the digital terminal device 1-1 are connected using sockets (not shown) based on a terminal bus interface; for example, the terminal bus 2 is provided with eight such sockets. The interface section 11 of the terminal bus monitor device 6 is connected to the digital terminal device 1-1.
The terminal bus monitor device 6 can be connected to an empty outlet by selecting an arbitrary empty outlet and connecting the terminal bus monitor device 6 to the terminal bus 2.

The bipolar signal being transmitted at a speed of 192KBPS on the terminal bus 2 is transferred to B-1 via the interface section 11.
1 conversion circuit 63, converts it into a unipolar signal, and sends it to frame extraction circuit 64. The unipolar signal is also sent to the clock generation circuit 65 and outputs a frequency of 192KHz.
Generates 64KHz and 16Kllz clocks.

The frame extraction circuit 64 uses a 192 KHz clock, detects the synchronization bit of the frame, finds the beginning position of the frame, and extracts the frame.

The frame is sent to the frame disassembly circuit 66, which disassembles and re-edits the frame, sends out the bit groups Bll, B12 of the data channel B1 to the output line h1 together with a 54 KHz clock, and sends the bit group Bll, B12 of the data channel B1 to the control channel D. The bits D1 to D4 of are sent to the output line d together with a 16KH2 clock.

The transmitted data on the data channel B1 and the control information on the control channel D are sent to a monitor measuring device, and the quality of the data and control information is determined.

Even if the data from the digital terminal device 1-1 is allocated to the data channel B2 of the frame, the data of the data channel B2 is output to the output line b2 of the frame decomposition circuit 66, so that it can be monitored. .

〔Effect of the invention〕

As explained above, in the present invention, the terminal bus monitor device of the present invention can be easily attached to a terminal bus to extract and monitor data and control information, just like a general digital terminal device. The hassle of preparing monitors is eliminated, and the operation of the home system is not hindered.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the principle of the present invention, Fig. 2 is a block diagram of a terminal lotus monitor device according to an embodiment of the present invention, Fig. 3 is a block diagram of a conventional in-home system, and Fig. 4 is a diagram of frames in the terminal lotus. It is an explanatory diagram. In the figure, 1-1 is a digital terminal device, 11 is an interface section, 2 is a terminal bus, 6 is a terminal bus monitor device, 61 is a frame extraction section, and 62 is a frame decomposition section.

Claims (1)

[Claims] A digital terminal device (1-
an interface section (11) having a terminal bus interface having the same configuration as 1); a frame extraction section (61) that extracts frames from the terminal bus 2 through which information is transmitted in frame format; and a frame extraction section (61) that decomposes the extracted frames. A terminal bus monitor device comprising: a frame disassembly unit (62) for extracting data and control information contained in the frame.